Improvement in sewjng-ivlachines



f `causeet'hecloth to advance in the usual manstock, andthe needle, allbeing in connection NITED n' Shrine'sv r M PROVEM ENT; l N Si'EvinNo#lui/lolames.4

Specification forniiugparrot' Letters raient No; 4252.284, dater] April(lf2,lllfv. i..

To all whom imag concern: 1 f 1)resser-fo'ot,with its usual -accesscries.H This vBe it kn'ownthat I, lWILLIAM,O.GrVRO,V ER, bracket supports-also a bobbin l i,orvfheupper 'of West Roxburyg in the county ot' Norfolk and thread,- a'sat z', and a tension apparatusrasat State of Massachusetts, have invented certain Ir', whichv may beof'any ordinal-yor propencong', new and usefnllmpro'vements inl Sewing-Mastruction ;-`or, in place 4 of Iatensionapparatus. lfhillf; and I 'dol-herebydcclare that the fol-j -fon the, threadfitmayfbe placed lupon :the bob?` l lowing,'taken` i'nconnection with-the drawings, bin. y. ll p 4 lis a fnll, ,clear,anr exact'description thereof'. f lSoforthereis lliothin'g'newinthe'coustrntr` In the li'a)\'ii1gs, '-Figx1rel isa side elevation, tion ofthe-machine: L

y and parts carrierlbyit being removed. Fig.3 portedin any'proper bearifngs'on thebra'cket is a front cle'vationwith.partsof theplatf'orm and'its rearward p'rojectioinm; i eartheifr 'ont euta'way. lFigsA and 5 are front elevations,y end offthis lshaftauarm, l,iis a`ttacl1erl,` Inml `inv detail; ofthe dr1'ving-pulley,;connectinglrod, thisarnih'as a slot `inyi,"which embraces 'a pin,

'Sepifcaand Slotted arm. Fig. Gis anae'le- ,l2-projecting-rearward from the needle-stock.

l 'ration 'inl' l(letali) explanatory of the take-up.' (See. l'fig's; 1 'a'mlodjA Upo'nthe rear end ot this v Fig'jsaplaufof the feeding.fmpara t us,` and rock-sh'aft'iskeyedory otherwise 's'e'curerlau-` Figs Sand 9re frontelevations ofthe Iseetorother arn, m', whichglcall--a fslotted a'rul'," t he piece angl yslotted arm, showingr a modification slot init .being curved;substantially as shown.' 'of the-sauge,v whichisin fact fliep'lanon whichv in Ihe',drawilngs.` Thisslot, infth'etbrm'BliQWij it'is preferred to construct the'machine.. j y in all the figures excepttheeighth-andnintlujs I The machine isvof the shuttle'variety,fai|d ourvjedinorder that-themotions ofthe'jneedle':-`

m y im proementsare applicable to machines of lmay bei sjlowenat certain periods ol' the stroke :that class.` v Theyiconsistin certain ,new appa-A and faster,atothers-thafh would be the 'caso .ratns for-actuatingftheneedle. p i if the'slonwerestraightorosome othercurve, r

"Themachiuc shown in the drawings is an `thusm lkingjthemachine more efcient; l butv embodiment'of theinventon in a working form, the slohlnay b@straigrht,'and its preciseeurvalnndyit .contains a bed-plale'or platformf'aa; "ft'ireisnot materialwh'en thepiu oagbhereinafter Vupon which the vwork issupported;4 with a redesc'rib'e moves both'downwardranrl"npwardc "i'olvingshaf'tbeneathibuponihchismounted A TOGkUIgSGCOLQOrS Dl-YOGll'IlOlllle-'P da canifwhich 'acts uponpin or roller in the ject-lona atof.' Apin', P02-projects rearwardf i-nd ot' a bent levenlbgto the long arm of whichvfrom this sector and is embracethby oueeudyoi the shuttie-driver'is connected.7 The shuttle la connecting-romp. w-lioseolthrer end surrounds l -is embraced byfth'e' drivena'nd is supported' -a crank'lpin upon the main` shaltlfFrom tbel by andlnoves'fh) avrace'injthe usual manner. front side1 ofgthe sector'projectsl ai:1other-pii1-,

0n the endfot -the revolving shaft is a cranli o3, and this pin enters andworksfi-utheslot of` pin, c, ,and/'a caio; d, theformer acting upon a vthe arm m.A Now, the pins oz'au'd 1ointhc yform l stud, c", and 'tbelatteraganst vthe lower surf of themachihe shownjn allthefigures except face of a frame, c. This frame has two prongs,- theeigh-th amdfnintl bearsucht relation to jeac-h Y, each of which enters anlear, f,-and `the prongs' other and vtothe" locationfotftherrnain shaft are freefto slide andoscllate up and down in that a revolution of'fthe latte'rncansesfthepin the holes in lthe ears. `The unattached end'of o3 to mow-e'downwad tillpil;l 1jr aches-'fa 'ointfl thcv frame is-fo'rced downward and away from lvertically.below theentero, (see Figlfggaml" p the ears by a spiral spring. (Glearly shown in "then upward till it reaches thepositidnshownl the drawings.) -When the shaft revolves this in Fig. 4. 1*IEIere-the pinstopsaud reverses'its'` frame receives motion in four directions., and lmotioludescending againV fto'ihe .position imparts thesermotions to theroughencd feed-v shown in Fig.- 5,'a nd' tl1er i l,risingV again to the .ing-Surface@ which is attached 'to' the uriner` position show-in Figs, laude;'suino sloaon side of the frame.' (SeeFig. 3.)" This" suri'a'ce'` Iarm, 'the rock-shaft, thc-'arm` l', the, needlcner.V Uponfthe fable "s secured a bracketor -with this pin, partake of thesel motions, ain-lV amn,g, supporting in its forward end,inpr`ope1; the-needle willudescend to?4 its utl'nost limits,' guides; apneedlestock,fh,and an ordinary ris'ea littlelto-spread-a .loom thon descenda little whilepart of tlieshuttle is passing through the loop,'and then rise again to its lhighest limits, and this second or partial descent and l 'consequent'rise-occupy the time during which the needle usually stands stili or at rest aft-er having'opened'a loop below the cloth in ordinary shuttle-machines, and this partial descent and rise effe-ct the same purpose'Y as the rest of the needle. Precisely-the same motions may, however, be imparted to the needle by'a modiflcation ofthe position of the pins and ot' the shape ot' the slot in the slotted arm,'all other parts of the machine remaining the same. In this moditication, which is the preferred plan, the pins are' arranged relatively to each other substantially as shown in Figs. 8 and i), and the-connectingrod oscillates the pin o2 upward and downward much as in the previously-described arrangement.

the sector thatitmoves downward and toward tbe shalt l till it reaches a point vertically below the pin o', or nearly so, and then retreats and rises o`n the same side of avertical line drawn through the cen'ter ofvpin o'. The pin o:i does not pass that verticalline, as in the ti rstdescribed arrangement; but in order to effect a slight rise ofthe needleafter itltas reached its lowest point anda corresponding and itumediately succeeding descent theslot is curved downward, as from .v lto y in Figs. 8 andi), and this part of the'slot is so curved that as the pin o3 descends and moves toward the shaft l it lifts the slotted arm, and. consequently the Fig. 8 the needle is again at its lowest point .l

of depression, and as the pin o3 moves further away from the shaft l it lifts the'needle until 'the pin ceases to oscillateA in thatdirection,

the needleat that moment bein g at its greatest elevation. y

Various degrees in thecurvature of the slot will, alter the motions of the needle'in degree, and' to such extent the curvature is not of great importance; but it is essential that the slot in this modilication of the machine, Figs. 8 and 9, should be so curved that the pin o3, while oscillating toward the shaft l,`shall rst depress the needle toits extreme limit and then lift it again slightly.

The motions of the slotted arm, rock-shaft, and needle are substantially thesame in both 'modifications -In.the one first described the' slight rise of the needle depends upon .the fact thatjthe pin o3 oscillates on each side of a vertical line draw throughthe` center of the pin or shaft o. In the latter this same slight rise is consequent upon the before-described curve ofi the slot in the Islotted arm.

Just in rear ofthe arm l a leverhp, is passed through a hole or orifice in a supporting The pin o3 in this case is s o arranged in relation to the oseillationsot' piece, q. One end of this lever embraces a. pin', 1', upon the arm l', and the other end has an eye in it, as at s'. The lever is free torock and slide in its supporting-piece, and the arm l', when in motion, causes the eye s to' descend as the needle-stock ascends, and .vice iversa. The upper thread ,passes from' the bobbin through.the tension apparatns,'thence throu gli the eye .9, in the vibrating lever `p2.,'thence through an eye, asat t, in the top ofthe 'needie-stock, thence between the two plates ol' a. friction apparatus, as at 0, then through an eye in the bracket, asat w, and finally through the eye ot the needle. cends it lifts-thread upward from the cloth twice as fast as the stock rises, owing to the fact that the thread leads in a bight through the eye in the stock, and as the stock'thus rises the eyes descends and pulls thread through the eye, in the4 stock as fast as the eye s descends and to the extent of tsdeseent. These actions on 'the thread are reversed as the'needie and stock descend, and it follws that the eye in the stock and the eye in the lever, by theirjoint action, control an amount of slack thread equal in length to twice the rise ofthe needle-eye above the cloth added to the range of motion of the eye in the lever p2. By thus controlling a large amount of slack thread in proportion tothe extent ot' motion ofthe needle a. com paratively-large shuttle can be used in connection with a needle having a comparatively-smallwr-.tnge of motion, and the machine is therefore more efficient in its action.

The friction apparatus t consists of two small disks, pierced at Itheir centers and supported upon a s'crew or pin. The disks are t'orced toward each otherjby 'a spiralspring, and the thread passes and is nipped between their. one, merely sufficient to prevent the slack thread. dropping below the needlepoint as the latter descends. When the eye ofthe needle passes below the cloth the slack thread is scribed, at .the rear end of a bracket, in connection with the arrangement of a rock-shaft extending along the bracket and carrying an arm tha-t actu'ates the needle-stock, in the man- .ner specified.

In testimony whereof I have hercunto'sub scribed my name.

' In presence 0t'-' JAMES C. WADE, JAMES H. BROWN.

W. o. Gaovna.

When thev stock as- This-nip on the thread is a very slight 

